Most importantly, feature-wise, it will allow for Force Touch. Like the latest 12-inch MacBook, pressure sensitivity in the trackpad allow users to push harder for new interactivity not available on older models. In this case: quick word definitions, and more accurate rewinding/fast-forwarding in videos. Multi-finger gestures to navigate back and forward in the browser or to access Mission Control also remain part of Apple’s trackpad experience. Unlike the new Magic Mouse, the updated trackpad is only sold separately, and for a heftier $129 (compared to the older model's opening price at $69 or less).